1200106321 has 4 divisors (see below), whose sum is σ = 1204377444. Its totient is φ = 1195835200.

The previous prime is 1200106283. The next prime is 1200106357. The reversal of 1200106321 is 1236010021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 586850625 + 613255696 = 24225^2 + 24764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200106321 - 2¹³ = 1200098129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200106295 and 1200106304.

It is not an unprimeable number, because it can be changed into a prime (1200106361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135140 + ... + 2135701.

It is an arithmetic number, because the mean of its divisors is an integer number (301094361).

Almost surely, 2^1200106321 is an apocalyptic number.

It is an amenable number.

1200106321 is a deficient number, since it is larger than the sum of its proper divisors (4271123).

1200106321 is an equidigital number, since it uses as much as digits as its factorization.

1200106321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271122.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1200106321 is about 34642.5507288364. The cubic root of 1200106321 is about 1062.6899524007.

Adding to 1200106321 its reverse (1236010021), we get a palindrome (2436116342).

The spelling of 1200106321 in words is "one billion, two hundred million, one hundred six thousand, three hundred twenty-one".